Installation

PHP 5.3.0, 5.3.1 and 5.3.2 do not have SNMP support. SNMP support has been restored in PHP 5.3.3.

The Windows distribution of Net-SNMP contains support files for SNMP in the
mibs directory. This directory
should added to Windows' environment variables, as MIBDIRS, with the
value being the full path to the mibs directory:
e.g. c:\usr\mibs.

Important notes for PHP prior to 5.4.0: In order to use the UCD SNMP package, you need to define
NO_ZEROLENGTH_COMMUNITY to 1 before
compiling it. After configuring UCD SNMP, edit config.h
or acconfig.h and search for
NO_ZEROLENGTH_COMMUNITY. Uncomment the #define line. It
should look like this afterwards:

#define NO_ZEROLENGTH_COMMUNITY 1

Now compile PHP --with-snmp[=DIR]
.

If you see strange segmentation faults in combination with SNMP commands,
you did not follow the above instructions. If you do not want to recompile
UCD SNMP, you can compile PHP with the
--enable-ucd-snmp-hack
switch which
will work around the misfeature.

If net-snmp was not installed in default c:\usr folder (which may be the case for most peoples used to Windows instead of Linux), then, you should also create SNMP_PERSISTENT_DIR system environment variable with "persistent" folder location (located in snmp folder).Otherwise, php will will create its own persistant folder in c:/usr/snmp/persistent folder, which is probably not what you want !